Improvement in lock-nuts



ROBERT WV. HAMILTON, OF NEW YORK, N. Y., ASSIGN OR TO WILLIAM L. WILLIAMS,

TTED1 STATES PATENT OFFICE.

OF SAME PLACE.

IMPROVEMENT IN LOCK-NUTS.

Specication forming part of Letters Patent No. 117,881, dated August 8, 1871.

To all whom it may concern:

Re it known that I, ROBERT W. HAMILTON, of the city and State of New York, have invented and made a certain new and useful Improvement in Lock-Nuts; and the following is declared to be a correct description of the same.

Lock-mits have heretofore been made in which the main nut that screws upon the bolt has been slittedand a tapering' screw-thread formed upon its periphery, upon which screws a clamping-nut to clamp the main nutto the bolt. The nature ot' my invention consists in providing' a slit in the endot' an ordinary bolt and a conical recess in the end of said bolt, in which recess a pointed bolt enters to spread the end ot the main bolt and clamp its thread against the thread of the nut, which latter receives the ends of both bolts, the clamping-bolt entering the outer end of said nut, and being' screwed against the main bolt at'ter the nut has been turned to its place on said main bolt.

In the drawing', Figure l is a longitudinal section, showing the nut and bolt. Fig'. 2 is a crosssection at the line a' x, and Fi 3 is an elevation ot' the clamping-bolt detached.

a is a screw-bolt ot' any desired size or character. At the screw end there is a longitudinal slit, b, and a conical recess, c. (I is the clampingbolt, consisting of a head, e, screw f, and conical plug g. The screwf is the same size and pitch as the screw upon the bolt a, so that the internal thread of the cylindrical nut h tits both of them. The nut h being' screwed upon the bolt a and tightened up to its place, the clamping-bolt d is entered in its outer end and serewed up until the conical plug g is forced into the recess c to spread the end ofthe bolt c and clamp it and the nut L together, so that the nut will not become loose in consequence ot' any jarring to which it may bc exposed. This clan'iping-bolt is easily and quickly applied, and the ordinary screw-bolt can be readily altered so as to use the cylindrical nut and clamping-lmlt.

I claim as my invention- 1. The screw-bolt, with a split end and taperin g recess, combined with the nut and clampingbolt, substantially as described.

2. A cylimlrical nut, receiving the ends of thc main and clamping-bolts, so that the nut is prevented t'rOm turning' by screwing the clampingbolt against the end ot' the main bolt, as set forth.

Signed by me this 3d day ot' March, 1871.

ROBERT XV. HAMILTON.

Witnesses p GHAs. H. SMiTH, GEO. T. PINOKNEY. 

